# Open eLMS vs ∫dx

The clearest difference is device support: ∫dx at 3 against Open eLMS's —. Open eLMS's advantage is iOS requirement (13.4 vs 15.1). On price and in-app purchases there is nothing between them.

Both are free to download. Open eLMS sells 1 one-off in-app purchase and ∫dx sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Open eLMS | ∫dx |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | — | No |
| Update frequency | — | Monthly |
| Size | 22 MB | 42 MB |
| Requires iOS | **13.4** | 15.1 |
| Devices | — | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Open eLMS Ltd.](https://appshunter.io/developer/735297927) | [PRANEEL AGRAWAL](https://appshunter.io/developer/1868893039) |

## What reviewers say

### Open eLMS

[App page](https://appshunter.io/ios/app/open-elms/id1641102555)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full version | $5.99 | one-time |


### ∫dx

[App page](https://appshunter.io/ios/app/dx-a-level-maths-practice/id6758026965)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| dx Premium Monthly | $4.99 | per month |
| dx Premium Annual | $12.99 | per year |


## Frequently asked questions

### Is Open eLMS free?

Open eLMS is free to download, with in-app purchases available.

### Is ∫dx free?

∫dx is free to download, with in-app purchases available.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*